Flue.



EDWIN M. CAMPFIELID, OF RICHMOND, INDIANA.

BLUE.

Specification of Letters Patent.

Patented Dec. 26, 1916.

Original application filed January 9, 1914, Serial No. 811,226. Divided and this application filed. June 24., 1916. Serial No. 105,663.

To all whom it may concern;

Be it known that I, EDWIN M. CAMPFIELD, a citlzen of the United States, resldlng at -Richmond, in the county of Wayne and State of Indiana, have invented a new and useful. Flue, of which the following is a specification.

This invention relates to fines such as employed in the construction of chimneys and like structures, one of the objects of the invention being to provide a one piece flue, as distinguished from a two piece flue such as disclosed in my copending application, Serial No. 54,696, filed October 7, 1915, and which one piece flue has a novel arrangement of air cells and interfitting ends whereby the air cells are carried across the joints between the flue sections so that the maximum efficiency of the cells as insulating mediums is attained.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings: Figure 1 is a view partly in elevation and partly in section of a portion of a flue embodying the present improvements. Fig. 2 is an end view of one of the sections.

The invention herein described is more particularly a division of an application filed by me on January 9, 1914, Serial No. 811,226.

It is to be understood that the flue sections 1 can be of any preferred cross sectional contour, either rectangular, cylindrical or of other configurations and each section can also be made up of one or more members properly held together as shown, for example, in my application hereinbefore mentioned. The walls of each section are provided with air cells 2 extending throughout the length thereof, there being a socket 3 in one end of each section, while the outer wall of each section is cut away at the other endthereof to form a reduced end portion 4 of a cross sectional area substantially equal to the cross sectional area of the socket 3 and of a length substantially equal to the depth of the socket. The air cells 2 are separated by longitudinal partitions and these partitions are exposed where the outer walls of the section are cut away, as indicated at 5. The air cells terminate close to the socket 3 but open through the other ends of the flue sections. Thus it will be seen that when two or more sections are superposed, the reduced end of each section will t into the socket 3 in the next adjoining section and the projecting or exposed ends of the partitions between the cells will fit tightly against the inner surfaces of the walls of the sockets. Consequently the air cells will thus be extended beyond the meet ing faces of the outer walls of the sections with the result that the dead air spaces will thus be carried past the joints and the efficiency of the cells as insulating means is thus materially increased.

By constructing a flue as air cells or dead air spaces prevent to a large extent the heating of the outer surfades of the flue and maintain the inner surfaces of said flue warm so that the danger of fires is not only eliminated but a better draft through the flue results.

What is claimed is A chimney flue section consisting of a hollow tile having air spaces extending longitudinally within the walls thereof and separated by partitions, said air spaces being-closed at one end, the outer portion of the hollow tile being cut away at one end to expose the air spaces and to form a continuous shoulder which surrounds the hollow tile, the partitions between the exposed portions of the spaces forming exposed longitudinal ribs extending from the shoulder to the end of the tile, the other end of the tile being formed with a recess of the same proportions as the reduced end of the tile whereby, when said tile is superposed upon an- 109 described, th e other like tile, the inner faces of the hollow my own, I have hereto affixed my signature tiles Will be flush and the exposed portions in the presence of two Witnesses.

of the ribs on one tile will engage the Wall of the recess in the adjoining tile and the air EDWVIN IELD' 5 spaces will be extended into the joint to eon- Witnesses:

stitute insulating means. ELIZABETH JONES,

In testimony th'at'I claim the foregoing as Anon M. SOHUERMAN. 7

Copies of this patent may be obtained for five cents''ach, by addressing the Commissioner of Patents.

Washington, D. C. 7 

